My friend spent about $3k in machine work, carbs, paying to have the carbs rebuilt and fairly long dyno session to tune the carbs. He made about 213rwhp.
In comparison I spent around $2.5k for a similar setup (triple webers, light headwork, cam) and made 180rwhp.
My stock turbo swap cost me maybe $400. Just adding parts to my previously NA engine. Oil pan, turbo manifold, turbo, jpipe (will be replaced with an intercooler soon), got a oil feed line made for $5 using some line that was laying around my friends shop.